Power-driven handsaw



Nov. 8, 1927. 1,648,008

c. M. sELBY ET AL, l

POWER DRIVEN HANDSAW Filed Deo, 1, 1925 BY E /V/from A TTORNE YS PatenteduNov'. 8, .1927. I

UNITED-STATES PATENT ePrice.

CHARLES'M. SELIBY AND OSCAR P. NYSTROM,y 0F HOLLAN). MICHIGAN, A'SSIGNOBS T0 HOLLAND FURNACE COMFANY, -OF HOLLAND, IillICHIG'AN.`

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.Application sled necmbe 1, 1925.,l serial no. 72,448.

rl`his invention relates to improved' electrically or power driven hand saws. I The object of the invention is to provide a simple and compact structure in which the vibrationvis minimized, enabling the structure to be used'in any relation without especially anchoring the case.

A; further Objectis to provide a simple device'which is usable with an ordinary eleclo tric drill motor.v i y y Ubjects pertaining todetails of construction and operation will appear from the detailed description to follow. The invention is defined and pointedout in the claims. structure embodying the features of our invention is illustrated in the accompanying drawing, forming a part of this application, in which Fig. 1 is a perspective 'view of our improved electrically driven hand sawu on a small scale. v

Fig. 2 is a side elevation of the same, ythe motor being shifted" to a diierentposition.

Fig.`3 is a top plan view of the structure as arran ed in Fig. 2, showing the saw slide and gui e: and counterbalance, the relation to the eccentrics and the-pitmen therefor being indicated by dotted lines in extreme positions of reciprocation. Fig. 4 is a detail transverse sectional view on line 4-4 of Fi s. 2, 3 and 5, showin the arrangement of t e eccentrics and o the eccentric rings and the method of guiding and maintaining the same in position.

Fig. 5 is a detail view in section taken on line 5-5 of Figs, 2 and 4C, with the front face plate 71 removed, showing the position and arrangement-and details of construction p ot the eccentrics and pitmen, portions ap- 40 pearing in dotted iines. Y

Fig. 6 is an enlarged detail cross sectional view on line 61-6 4ot Figs. 2 and 3, showing details ot the connection of the pitmen to the saw slide. f l

In the drawings inv al1 the views'same parts are identified by theA .same numerals of reference. 1 is the main motor case, being of the usual construction of such motor for y nut-51 for retaining the saw driving meansy in place. The mechanism `comprises a casing with a main yface 'platep'fand a cover plate `71, suitably spaced to receive the driv'-v ing eccentrics and connections. Diametrircally, across the face of the cover plate 71 isv I0 the saw guide 8 extended at the o poste side of the face lto serve as a guide or ther counterbalance slide. f

The saw 9, usually of the key-hole type, isslotted and retained in place on the saw slide 91 by screws 92 in a suitable slot. The' saw is driven by the pitman 10 connected thereto by a shouldered screw 101 which is journaled through the saw slide 91 and reciprocates in a slot 81 in the bottom ot the 7m saw guide. The pitman is driven by eccentric 12, which is secured bya suitable set screw 121 to the shaft 5.' An eccentric wring 102 embraces eccentric 12 andk connects by pitman 10 and pivot 1014 to the lsaw slide ,91. 75

rl`he counterbalance slide 98 for the saw and slide issimilarly disposed in the dianietrically opposite position in the saw guide extension and is of the same weight. Exactly opposed to the eccentric 12`is the 8 eccentric 13 to serve as a counterbalance therefor and itis connected by pitman v11 tothe counterbalance slide 93 in the same manner that pitman 10 is connected to the saw slide 91.

A loop handle 14 is preferably castintegral with the main 4plate 7 of the casing.

We have shown our improved power driven hand saw in its improved form. The saw may be operated by any suitable connection in place of the electric motor, although it is especially adapted to the hand electric drill motor. We desire to claim the invention broadly and s eciiically, as pointed out in the appended c aims. u

Having thus described our inventwn, what we claim as neva/and desire to secure by Letters Patent is:

1. In an electrically ower driven hand saw, the combination o a portable motorj 10o with projecting drivin shaft, a case at tached to said shaft wit a transverse gulde way disposed diametrically across .lts face, p a saw slide with saw in one of said 1de ways and a counterbalance slide wel t 1n 105 the opposite end, opposed connterba'anced eccentrics with pitmen connected' thereto one of which is connected Ato drive the sai saw and the Aother of whihris connected to the counterweight slide, coacting as specified.

- driving shaft, a case 2. Ina ower driven hand saw, the combination o driving means with projecting attached to said shaft, with a transverse guide way disposed dianietrically across its face, a saw slide with saw in one of said guide Ways and ya. counterbalance slide weifrht in the opposite en d,

and opposed counterialanced eccentrics with pitmen connected thereto, one of which is connected to drive the said saw and the other of which is connected to the countercoacting as specified.

weight slide,

3. In a power driven hand saw, the comhination with driving mechanism of a drivmg shaft, opposed counterbalanced eccentrics thereon, a saw with extended uide, a

saw pitman connection to one of sai eccen tries, and a counterweight disposed opposite to said saw with a. pitman connection to actuate said counterweight in opposition to said saw, as specified.

rIn witness whereof we have hereunto set our hands.

CHARLES M. SELBY. OSCAR P. NYSTROM. 

